A dust collector ash hopper deposit combustion inhibition device and method

Abstract

This invention discloses a device and method for suppressing the reignition of ash accumulation in a dust collector hopper. An upper air supply pipe (3) and a lower air supply pipe (4) are installed inside the ash hopper (5) and connected to the main air inlet pipe (1) through fittings. The upper air supply pipe (3) has holes at equal intervals along the straight line of the bottom center of the pipe, and the holes are fixedly connected to the upper nozzle (10). The lower air supply pipe (4) has holes at equal intervals along the straight line of the top center of the pipe, and the position of the holes is between two adjacent upper nozzles (10). A guide rod (7) is fixedly installed on the top surface of the lower air supply pipe (4). A limiting plate (8) is fixedly connected to the top of the guide rod (7). The movable cover plate (9) is composed of a cover plate (91), a connecting rod (92), and a guide ring (93). The movable cover plate (9) is matched with the lower nozzle (6) and is coaxially arranged. The guide ring (93) is sleeved on the guide rods (7) on both sides of the lower nozzle (6). This invention rapidly blocks and extinguishes fires in the ash hopper, effectively preventing large-scale burning of filter bags and safety accidents caused by fires in the ash hopper, reducing operation and maintenance costs, and ensuring the safe operation and structural reliability of the dust collector.

Description

Technical Field

[0001] This invention belongs to the field of industrial flue gas treatment technology, specifically relating to a device and method for suppressing the reignition of ash accumulation in a dust collector hopper. Background Technology

[0002] When industrial furnace flue gas carries unburned sparks into the dust collector ash hopper, the ash temperature continues to rise due to the accumulation of high-temperature dust in the ash hopper. Once the oxygen content increases to a certain percentage, smoldering and reignition may occur in the ash hopper.

[0003] When the ash hopper of a bag filter reignites, it will burn the filter bags. Whether it is an electrostatic precipitator or a bag filter, the reignition of ash in the ash hopper may cause serious accidents such as internal fires and combustion. This will pose a serious threat to the safe and stable operation and structural safety of the dust collector, and must be taken seriously and prevented.

[0004] To address the issues of spark-containing flue gas and the potential for reignition in the ash hopper, engineering projects typically install spark capture and extinguishing devices at the dust collector inlet flue to minimize the amount of sparks entering the dust collector ash hopper. However, the occurrence of sparks escaping into the dust collector remains frequent. To prevent the escaping sparks from reigniting in the ash hopper, nitrogen gas is usually injected into the lower part of the ash hopper (near the ash discharge port) for fire extinguishing protection.

[0005] However, this measure has the risk that the nitrogen inlet may become clogged due to being buried in dust for a long time, making it impossible to extinguish the fire in time. In addition, when high-pressure nitrogen is injected, the high-speed airflow may stir up sparks and high-temperature dust, which may lead to burning and damage to the filter bag. Summary of the Invention

[0006] To address the safety concerns of dust collectors during spontaneous combustion incidents in ash hoppers, this invention proposes a device and method for suppressing the reignition of ash accumulation in dust collector hoppers, ensuring the safe operation of filter bags and the dust collector.

[0007] The technical solution of this invention is: a dust collector ash hopper ash re-ignition suppression device, comprising an inlet main pipe, a solenoid valve assembly, an upper air supply pipe, a lower air supply pipe, an ash hopper, a lower nozzle, a guide rod, a limiting plate, a movable cover plate, an upper nozzle, an oxygen meter, and a temperature sensor; the inlet main pipe is laid outside the ash hopper; the solenoid valve assembly is installed on the inlet main pipe; the upper and lower air supply pipes are installed inside the ash hopper, and are connected to the inlet main pipe through fittings; the upper air supply pipe is laid and installed on the bottom surface of the uppermost pipe support inside the ash hopper, and is fixedly connected to the pipe support; the lower air supply pipe is laid and installed directly below the upper air supply pipe, and is fixedly connected to the wall panel of the ash hopper; the upper air supply pipe runs along the pipe... The bottom gas pipe has equally spaced openings along a straight line, which are fixedly connected to the upper nozzles. The lower gas pipe also has equally spaced openings along a straight line from the top, with the openings positioned between adjacent upper nozzles; these openings are fixedly connected to the lower nozzles. A guide rod is fixedly installed on the top surface of the lower gas pipe and coaxially arranged with the upper nozzles. A limiting plate is fixedly connected to the top of the guide rod. The movable cover plate consists of a cover plate, a connecting rod, and a guide ring. The movable cover plate is matched with and coaxially arranged with the lower nozzles. The guide ring is fitted onto the guide rods on both sides of the lower nozzles, allowing the movable cover plate to slide up and down along the guide rods. A temperature sensor is installed at the bottom of the ash hopper. An oxygen meter is installed in the cavity between the upper and lower gas pipes.

[0008] According to an embodiment of the present invention, the movable cover plate is concentrically arranged with the lower nozzle and covers the nozzle; the movable cover plate slides freely up and down along the guide rod, and the size of the cover plate is not less than the outer diameter of the lower nozzle, and the inner diameter of the guide ring is not less than the outer diameter of the guide rod.

[0009] According to an embodiment of the present invention, the guide rod is coaxially arranged with the upper nozzle, and the outer diameter of the limiting plate is not less than the inner diameter of the guide ring.

[0010] According to an embodiment of the present invention, the upper gas pipeline and the lower gas pipeline are equal-diameter pipes or variable-diameter pipes, and are arranged in an array, a square, or a cross shape.

[0011] According to an embodiment of the present invention, the solenoid valve group includes one solenoid valve and three shut-off valves, which are connected by pipelines to form a valve group; the solenoid valve group is connected to the control system.

[0012] A method for suppressing the reignition of ash accumulation in a dust collector hopper includes a double-layered air supply pipe, consisting of an upper air supply pipe and a lower air supply pipe, located in the upper part of the hopper. The upper nozzle faces downwards, while the lower nozzle faces upwards. The upper and lower nozzles are arranged at equal intervals and facing each other. High-speed inert gas ejected from the upper and lower nozzles collides and reflects off a limiting plate and a movable cover plate, respectively, and diffuses radially on the same horizontal plane, forming an isolation air curtain between the double-layered air supply pipes to suppress, block, and extinguish the fire in the ash hopper.

[0013] The control system periodically starts the solenoid valve assembly to switch the inert gas on and off.

[0014] The working principle of this invention is as follows: The control system monitors the temperature and oxygen content parameters inside the ash hopper in real time. When the temperature and oxygen content in the ash hopper rise abnormally, the control system interlocks and opens the solenoid valve on the main air inlet pipe, delivering inert gas to the upper and lower air supply pipes. The high-pressure gas ejected at high speed from the upper nozzle collides and reflects with the limiting plate directly below it, causing the airflow to diffuse radially. Simultaneously, the high-pressure gas ejected at high speed from the lower nozzle lifts the movable cover plate, and the guide ring slides upward along the guide rod to the limiting plate, causing the movable cover plate to move to its limit position. The high-pressure airflow collides and reflects with the cover plate, and the airflow also diffuses radially. After the reflected airflow diffuses, an isolation air curtain is formed between the upper and lower air supply pipes, thereby achieving the function of quickly suppressing, blocking, and extinguishing the fire in the ash hopper. When the temperature and oxygen content in the ash hopper are detected to drop to a safe range, the control system interlocks and closes the solenoid valve, the air supply pipe stops supplying gas, and the movable cover plate slides downward along the guide rod and falls back to its initial position, covering the lower nozzle and preventing the nozzle from being blocked by dust.

[0015] The beneficial technical effects of this invention are as follows: By installing an inert gas isolation air curtain device in the upper part of the ash hopper, the risk of dust and sparks being blown up by the airflow and scorching the filter bags can be avoided during conventional nitrogen purging operations, where the nitrogen purging port is located in the lower part of the ash hopper and buried in the dust. This prevents premature filter bag failure and failure. At the same time, it can also suppress the reignition and smoldering of sparks and other combustibles in the ash hopper upon encountering oxygen, and quickly block and extinguish the fire in the ash hopper, effectively preventing large-scale burning of filter bags and safety accidents caused by fire in the ash hopper, reducing operation and maintenance costs, and ensuring the safe operation and structural reliability of the dust collector. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a dust collector ash hopper ash re-ignition suppression device.

[0017] Figure 2 yes Figure 1 Schematic diagram of the movable cover plate.

[0018] Figure 3 yes Figure 1 Schematic diagram of the gas pipeline layout.

[0019] In the diagram: 1. Main intake pipe, 2. Solenoid valve assembly, 3. Upper air supply pipe, 4. Lower air supply pipe, 5. Ash hopper, 6. Lower nozzle, 7. Guide rod, 8. Limiting plate, 9. Movable cover plate, 10. Upper nozzle, 11. Oxygen meter, 12. Temperature sensor, 91. Cover plate, 92. Connecting rod, 93. Guide ring. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] A dust collector ash hopper ash re-ignition suppression device includes: an inlet main pipe 1, a solenoid valve group 2, an upper air supply pipe 3, a lower air supply pipe 4, an ash hopper 5, a lower nozzle 6, a guide rod 7, a limiting plate 8, a movable cover plate 9, an upper nozzle 10, an oxygen meter 11, a temperature sensor 12, a cover plate 91, a connecting rod 92, and a guide ring 93.

[0022] The main air inlet pipe 1 is located outside the ash hopper 5; the upper air supply pipe 3 and the lower air supply pipe 4 are both located in the upper space inside the ash hopper 5 and are welded to the main air inlet pipe 1 through fittings such as tees and elbows; the solenoid valve group 2 is installed on the main air inlet pipe 1 using a flange connection; the upper air supply pipe 3 is installed below the uppermost pipe support (steel mesh support) inside the ash hopper 5 and is welded and fixed to the bottom of the pipe support; the bottom of the upper air supply pipe 3 has equally spaced holes along the straight line of the bottom center of the pipe, and the upper nozzle 10 is threaded to each hole with the nozzle facing downward; the lower air supply pipe 4 is located 100mm below the upper air supply pipe 3 and is welded and fixed to the wall panel of the ash hopper 5; the top of the lower air supply pipe 4 has equally spaced holes along the straight line of the top center of the pipe, and the lower nozzle 6 is threaded to each hole with the nozzle facing upward; the lower nozzle 6 is threaded to the upper nozzle 10 with the upper nozzle 10 with the upper nozzle 10. The nozzles 10 are spaced apart and arranged at equal intervals of 400mm. The guide rod 7 is made of φ6mm round steel, coaxially arranged with the upper nozzle 10, and welded to the top of the lower air supply pipe 4. The limiting plate 8 is made of φ80×5mm steel plate and welded to the top of the guide rod 7. The movable cover plate 9 is welded from the cover plate 91, the connecting rod 92 and the guide ring 93. The cover plate 91 is φ80×5mm, the guide ring 93 is made of φ4mm steel wire and has an inner diameter of φ10mm, and the connecting rod 92 is made of φ4mm steel wire. The movable cover plate 9 is coaxially arranged with the lower nozzle 6. The guide ring 93 is sleeved on the guide rods 7 on the adjacent sides of the lower nozzle 6 and is movably connected to the guide rods 7. The movable cover plate 9 covers the lower nozzle 6 in the non-working state and can slide freely up and down along the guide rod 7 in the working state.

[0023] The method for suppressing and isolating the reignition of ash accumulation in the ash hopper proposed in this invention is as follows: a double-layer gas supply pipe is laid in the upper space inside the ash hopper 5. Opposite nozzles are arranged at equal intervals on the gas supply pipes. The high-speed inert gas ejected from the nozzles collides and reflects with the limiting plate 8 and the movable cover plate 9 respectively, and diffuses radially to form an isolation air curtain between the double-layer gas supply pipes, thereby suppressing, blocking and extinguishing the fire in the ash hopper.

[0024] The upper part of the ash hopper 5 is equipped with two layers of gas supply pipes: an upper gas supply pipe 3 and a lower gas supply pipe 4. The upper nozzle 10 faces downwards, while the lower nozzle 6 faces upwards. The upper and lower nozzles are arranged at equal intervals and facing each other. The spacing between the two layers of gas supply pipes is designed as needed.

[0025] The outlets of the lower nozzles 6 are all covered by coaxially arranged movable cover plates 9, which can slide freely up and down along the guide rod 7; the size of the cover plate 91 is not less than the orifice diameter of the lower nozzles 6, preferably 2 to 10 times the orifice diameter, depending on the design; the inner diameter of the guide ring 93 is not less than the outer diameter of the guide rod 7, preferably with a gap of 1 to 5 mm, depending on the design.

[0026] The guide rod 7 is coaxially arranged with the upper nozzle 10, and the size of the limiting plate 8 at its top shall not be less than the inner diameter of the movable cover plate guide ring 93.

[0027] The high-speed inert gas ejected from the upper nozzle 10 and the lower nozzle 6 impacts and reflects off the limiting plate 8 and the movable cover plate 9 respectively, and diffuses radially on the same horizontal plane, forming an isolation air curtain between the two gas pipes.

[0028] Both the upper gas pipeline 3 and the lower gas pipeline 4 can be made of equal diameter or variable diameter pipes, and their arrangement can be in various forms such as array, square or cross, depending on the needs.

[0029] The cross-section of the nozzles 6 and 10 can be circular, square, or other shapes, and the specific shape is not limited. The orifice diameter (equivalent orifice diameter) can be designed with equal or variable diameter, and the orifice diameter range is preferably 5 to 25 mm, depending on the requirements.

[0030] The solenoid valve group 2 includes one solenoid valve and three shut-off valves, which are connected by pipelines to form a valve group. The solenoid valve group has a nitrogen gas switching function. When the solenoid valve malfunctions, it can be removed for repair or replacement. At the same time, the nitrogen gas is bypassed, so as not to affect the gas supply.

[0031] To prevent blockage of the upper nozzle 10 and caking or jamming of the movable cover 9, the control system periodically and briefly activates the solenoid valve 1, using high-pressure gas to promptly blow away and remove foreign objects from the upper nozzle 10. Simultaneously, it periodically activates the movable cover 9 to ensure smooth sliding. The specific activation frequency and ventilation time are not limited and can be selected as needed.

[0032] Both the lower nozzle 6 and the upper nozzle 10 are circular nozzles, and each of their nozzles adopts a variable diameter design with a diameter range of 8 to 20 mm, and they are arranged in groups as needed.

[0033] The upper gas transmission pipe 3 consists of a main branch pipe and three branch pipes. The main branch pipe is arranged longitudinally after passing through the ash hopper 5, and the three branch pipes are arranged horizontally in parallel and are welded to the main branch pipe respectively.

[0034] The lower gas pipeline 4 and the upper gas pipeline 3 are arranged horizontally in parallel, with a center-to-center distance of 100 mm, and can be designed and adjusted as needed.

[0035] To prevent the upper nozzle 10 from becoming clogged and the movable cover 9 from hardening or jamming, the control system periodically and briefly activates the solenoid valve group 2 to use high-pressure inert gas to promptly blow away and remove foreign objects from the upper nozzle 10. At the same time, the movable cover 9 is periodically activated to ensure smooth sliding. The activation frequency is 2 to 3 times per day or 1 to 2 times per shift, and the ventilation time is 10 to 30 seconds, which can be selected and adjusted as needed.

[0036] The basic working method and process of the invention: The control system monitors the temperature and oxygen content parameters in the ash hopper 5 in real time through the oxygen meter 11 and the temperature sensor 12. When the temperature and oxygen content in the ash hopper 5 rise abnormally, the control system interlocks and opens the solenoid valve group 2 on the main air intake pipe 1 to deliver nitrogen to the upper air supply pipe 3 and the lower air supply pipe 4. The upper nozzle 10 ejects high-pressure nitrogen at high speed, which collides and reflects with the limiting plate 8 directly below it, and the airflow diffuses radially. At the same time, the high-pressure nitrogen ejected at high speed from the lower nozzle 6 lifts the movable cover plate 9, and the guide ring 93 slides upward along the guide rod 7 to the limiting plate 8, so that the movable cover plate 9 moves to the limit position. The high-pressure airflow collides and reflects with the cover plate 91, and the airflow also diffuses radially. After the reflected airflow diffuses, an isolation air curtain is formed between the upper and lower air supply pipes, thereby achieving the function of quickly suppressing, blocking and extinguishing the fire in the ash hopper. When the temperature and oxygen content in the ash hopper 5 are detected to drop to a safe range, the control system interlocks and closes the solenoid valve group 2, the gas supply pipe stops supplying gas, and the movable cover 9 slides down along the guide rod 7 and falls back to the initial position, covering the lower nozzle 6 to prevent the nozzle from being blocked by dust.

[0037] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A device for suppressing the reignition of ash accumulation in a dust collector hopper, characterized in that: The system includes an intake manifold (1), a solenoid valve assembly (2), an upper gas delivery pipe (3), a lower gas delivery pipe (4), an ash hopper (5), a lower nozzle (6), a guide rod (7), a limiting plate (8), a movable cover plate (9), an upper nozzle (10), an oxygen meter (11), and a temperature sensor (12). The intake manifold (1) is laid outside the ash hopper (5). The solenoid valve assembly (2) is installed on the intake manifold (1). The upper gas delivery pipe (3), lower nozzle (4), guide rod (5), limit plate (6), movable cover plate (7), guide rod (8), limit plate (9), upper nozzle (10), oxygen meter (11), and temperature sensor (12). The upper gas pipe (4) is installed inside the ash hopper (5). The upper gas pipe (3) and the lower gas pipe (4) are connected to the main air inlet pipe (1) through fittings. The upper gas pipe (3) is laid and installed on the bottom surface of the uppermost pipe support inside the ash hopper (5) and is fixedly connected to the pipe support. The lower gas pipe (4) is laid and installed directly below the upper gas pipe (3) and is fixedly connected to the wall panel of the ash hopper (5). The upper gas pipe (3) is evenly spaced along the straight line direction of the bottom center of the pipe. The opening is fixedly connected to the upper nozzle (10); the lower gas pipe (4) has openings at equal intervals along the straight line of the top center of the pipe, and the opening position is between two adjacent upper nozzles (10), and the opening is fixedly connected to the lower nozzle (6); the guide rod (7) is fixedly installed on the top surface of the lower gas pipe (4) and is arranged coaxially with the upper nozzle (10); the limiting plate (8) is fixedly connected to the top of the guide rod (7); the movable cover plate (9) is made of the cover plate ( 91) The connecting rod (92) and guide ring (93) are used together; the movable cover plate (9) is matched with the lower nozzle (6) and is coaxially arranged; the guide ring (93) is sleeved on the guide rods (7) on both sides of the lower nozzle (6) so that the movable cover plate (9) can slide up and down along the guide rods (7); the temperature sensor (12) is installed at the bottom of the ash hopper; the oxygen meter (11) is installed in the cavity between the upper gas pipe (3) and the lower gas pipe (4).

2. The dust collector ash hopper ash re-ignition suppression device according to claim 1, characterized in that: The movable cover plate (9) is concentrically set with the lower nozzle (6) and covers the nozzle; the movable cover plate (9) slides freely up and down along the guide rod (7), the size of the cover plate (91) is not less than the outer diameter of the lower nozzle (6), and the inner diameter of the guide ring (93) is not less than the outer diameter of the guide rod (7).

3. The dust collector ash hopper ash re-ignition suppression device according to claim 1, characterized in that: The guide rod (7) is coaxially arranged with the upper nozzle (10), and the outer diameter of the limiting plate (8) is not less than the inner diameter of the guide ring (93).

4. The dust collector ash hopper ash re-ignition suppression device according to claim 1, characterized in that: The upper gas pipeline (3) and the lower gas pipeline (4) are made of equal diameter or variable diameter pipes and are arranged in an array, a square or a cross shape.

5. The dust collector ash hopper ash re-ignition suppression device according to claim 1, characterized in that: The solenoid valve group (2) includes one solenoid valve and three shut-off valves, which are connected by pipelines to form a valve group; the solenoid valve group (2) is connected to the control system.

6. A method for suppressing the reignition of ash accumulation in a dust collector hopper using the apparatus described in any one of claims 1-5, characterized in that: The upper part of the ash hopper (5) is provided with an upper gas supply pipe (3) and a lower gas supply pipe (4) with a double layer of gas supply pipes. The upper nozzle (10) sprays downward and the lower nozzle (6) sprays upward. The upper and lower nozzles are arranged opposite each other at equal intervals. The high-speed inert gas ejected from the upper nozzle (10) and the lower nozzle (6) collides and reflects with the limiting plate (8) and the movable cover plate (9) respectively, and diffuses radially to form an isolation air curtain between the double gas supply pipes, thereby suppressing, blocking and extinguishing the fire in the ash hopper.

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